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Borrowings - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Debt Instrument [Line Items]            
FHLB borrowings $ 135,000     $ 135,000   $ 10,111 [1]
Federal home loan bank stock 6,500     6,500   1,700
Subordinated notes, net outstanding 39,953     39,953   39,986 [1]
Subordinated Notes [Member]            
Debt Instrument [Line Items]            
Subordinated notes, net outstanding 40,000     $ 40,000   40,000
Subordinated Notes [Member] | 2029 Notes [Member]            
Debt Instrument [Line Items]            
Subordinated debt instrument maturity date       Oct. 15, 2029    
Debt instrument carrying amount 25,200     $ 25,200    
Debt instrument, unamortized premium $ 729     $ 729    
Effective interest rate 4.90% 4.70%   5.00% 4.70%  
Subordinated Notes [Member] | 2030 Note [Member]            
Debt Instrument [Line Items]            
Subordinated debt instrument maturity date       Jun. 01, 2030    
Effective interest rate 6.10% 6.30%   6.10% 6.30%  
Unamortized debt issuance cost $ 14,700     $ 14,700    
Unsecured Lines of Credit [Member]            
Debt Instrument [Line Items]            
Maximum overnight line of credit facilities available 44,000     44,000   44,000
Overnight line of credit facilities outstanding 0     0   0
Federal Reserve Paycheck Protection Program Liquidity [Member]            
Debt Instrument [Line Items]            
Percentage of advances on PPP loan value and term     100.00%      
Fixed annual cost basis points     0.35%      
Total advances 60     $ 60    
Maturity date of FRB borrowings       Jun. 06, 2025    
FHLB [Member]            
Debt Instrument [Line Items]            
Loans outstanding $ 293,900     $ 293,900   358,100
Federal home loan bank advances, maximum borrowing capacity percentage on assets       30.00%    
Federal home loan bank, advances, interest Rate 1.82%     1.82%    
FHLB borrowings $ 135,000     $ 135,000   10,000
Subordinated debt instrument maturity date       May 08, 2023    
FHLB [Member] | Restricted Equity Investments [Member]            
Debt Instrument [Line Items]            
Federal home loan bank stock 6,500     $ 6,500   $ 1,700
FHLB [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
FHLB borrowings 73,800     73,800    
FHLB [Member] | Line of Credit [Member] | Public Deposits with Treasury Board of Virginia [Member]            
Debt Instrument [Line Items]            
Assets pledged with federal home loan bank against credit facilities $ 85,100     $ 85,100    
[1] Derived from audited December 31, 2021 Consolidated Financial Statements.